Finding the Third Proportional to 178,310.50 and 276,990

Step by Step Solution

1. Step 1: Write the proportion equation
   178,310.50 : 276,990 = 276,990 : x
2. Step 2: Convert to fraction form
   178,310.50/276,990 = 276,990/x
3. Step 3: Cross multiply
   178,310.50x = 276,990 × 276,990
4. Step 4: Simplify right side
   178,310.50x = 76,723,460,100
5. Step 5: Solve for x
   x = 76,723,460,100/178,310.50
6. Step 6: Final answer
   x = 430,280.10